SUBNAUTICA 2 GUIDEDeep-sea field manual
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Rockgrub (Below Zero)

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The Rockgrub is a small, passive, bioluminescent fauna species found in the Arctic biomes of Subnautica: Below Zero. It serves as bait for Rock Punchers and inhabits caves and mining sites.

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Rockgrub (Below Zero)

Rockgrub Fauna (BZ)

AttributeValue
CategoryFauna
DietScavengers & Parasites
AttitudePassive
BiomeCrystal Caves, Main Crystal Caves, East Arctic, Koppa Mining Site, West Arctic
Respawn Time300 seconds (only when killed by a creature)
Debug IDrockgrub
Size1

The Rockgrub is a passive fauna species. Despite superficially resembling an invertebrate, the PDA states that it is a possible relative of the Sand Shark.

Appearance

The Rockgrub is tiny in size. Its body is slim, round and segmented. It also has two swimming fins on either side and a larger flipper serving as the tail. The creature has five appendages on each side of its body, and a circular maw containing many small teeth.

The Rockgrub's most notable feature is the constant, bright bioluminescent green glow that its entire body emits to light up a small spherical area around itself.

Behavior

The Rockgrub swims rather quickly within its vicinity, seemingly scavenging whatever it could find. They are most visible in darker areas such as caves. Rockgrubs tend to traverse on tunnel walls or any surface in its vicinity.

Rockgrubs can be picked up and used as bait for Rock Punchers to which they are prey.

Data Bank Entry

650px-RockGrubEncy

A small, luminescent scavenger, roughly thumb-sized. This creature may be a distant relative of the sand shark, sharing that species' unusual limbs, segmented exoskeleton and burrowing behavior.

  1. Jaw: Its circular set of teeth is designed to tear up clumps of coral and sea grass caught on the rocks.
  2. Limbs: Five legs, two arms and a large flipper allow the rockgrub to cling to and walk across rock faces in search of food, and swiftly swim to safety when under attack.
  3. Green Luminescence: Glowing green in the dark would seem like a poor survival strategy, but this adaptation may be a mating behavior or other specialized process, engaged in by only a fraction of the total population at any one time. Or perhaps being eaten is simply part of the rockgrub's lifecycle.

Assessment: Harmless

Source: Scan

Front view Front view

Side view Side view

Dorsal view Dorsal view

Bioluminescence Bioluminescence

Rockgrub on a platform in the Koppa Mining Site Rockgrub on a platform in the Koppa Mining Site

Rockgrubs on the Koppa Mining Site cave walls. Rockgrubs on the Koppa Mining Site cave walls.

Size comparison with the player Size comparison with the player

Rock Puncher Concept Art featuring the Rockgrub. Rock Puncher Concept Art featuring the Rockgrub.

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